A low temperature resistant overhead insulated cable

Abstract

The utility model discloses a low-temperature resistant overhead insulated cable, comprising a conductive layer, wherein at least three groups of conductive layers are arranged, the conductive layers are tightly twisted by annealing copper wires, insulating layers are arranged outside the conductive layers, a wrapping layer is fixed outside the insulating layer by overlapping wrapping, a filling layer is filled outside the wrapping layer, a wrapping layer is fixed outside the filling layer by overlapping wrapping, a shielding layer is fixed outside the wrapping layer, an inner lining layer is fixed outside the shielding layer by aligning wrapping, a low-temperature resistant layer is arranged outside the inner lining layer, an armor layer is twisted outside the low-temperature resistant layer, a protective layer is arranged outside the armor layer, cross-linked ethylene propylene rubber is used as the insulating layer, the insulating layer has good insulation itself, and at the same time, it has a large carrying capacity, does not contain halogen, and will not emit a large amount of smoke when burned; it also has flame retardant properties and ozone-resistant stability, and can be used in a low-temperature environment of -50°C to prevent the conductive layer from being easily cracked.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature resistant cables, in particular to a low-temperature resistant overhead insulated cable. Background Art

[0002] With the development of the electric power industry, the demand and requirements for cables in all walks of life are also increasing. my country has a vast territory. In addition to the North China and Central China regions with excellent terrain, a large number of cables also need to be installed in the northwest region. In northern my country, due to climate and environmental issues, the selection and construction of power cables has always been a major problem that has troubled the majority of owners, construction units and designers. Due to the cold climate, traditional power cables have many disadvantages in winter construction, such as short construction period, brittle cable sheath, easy cracking, and weakened bending performance. Forced construction can easily cause huge material waste and safety hazards. Therefore, a cold-resistant power cable that can be used in basic industries and civil construction in cold areas is needed. Utility Model Content

[0003] In view of the above problems, the utility model provides a low-temperature resistant overhead insulated cable, which has high low-temperature resistance.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-temperature resistant overhead insulated cable, comprising a conductive layer, wherein at least three groups of the conductive layers are arranged, the conductive layers are tightly twisted by annealed copper wires, insulating layers are respectively arranged on the outside of the conductive layers, a wrapping layer is fixed to the outside of the insulating layer by overlapping wrapping, the outside of the wrapping layer is filled with a filling layer, the outside of the filling layer is fixed with a wrapping layer by overlapping wrapping, a shielding layer is fixed to the outside of the wrapping layer, an inner lining layer is fixed to the outside of the shielding layer by aligning wrapping, a low-temperature resistant layer is arranged on the outside of the inner lining layer, an armor layer is twisted on the outside of the low-temperature resistant layer, and a protective layer is arranged on the outside of the armor layer.

[0005] Preferably, the conductive layer is made of annealed round copper wires that are tightly twisted to form a cylindrical shape, and the insulating layer is made of cross-linked ethylene propylene rubber and is coated on the outer surface of the conductive layer by an extruder.

[0006] Preferably, the material of the tightening layer is polyvinyl fluoride, the tightening layer overlaps and covers the outer surface of the insulating layer with an overlap rate of 20% of the width of the tightening layer, the material of the filling layer is acrylic fiber and viscose fiber carbonized at high temperature, the filling layer wraps the three conductive layers and forms a cylindrical shape.

[0007] Preferably, the wrapping layer is made of polytetrafluoroethylene, the wrapping layer overlaps and covers the outer surface of the filling layer with an overlap rate of 50% of the wrapping layer width, the shielding layer is woven with copper wire, and the weaving density of the shielding layer ranges from 70% to 90%.

[0008] Preferably, the inner lining layer is made of polyester film tape, which is wrapped and fixed on the outer surface of the shielding layer by seam wrapping, and the low-temperature resistant layer is made of butadiene rubber and is coated on the outer surface of the low-temperature resistant layer by an extruder.

[0009] Preferably, the armor layer is formed by tightly winding low-carbon steel wires, and the material of the protective layer is diene nitrile rubber and is coated on the outer surface of the armor layer by an extruder.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] 1. Cross-linked ethylene propylene rubber is used as the insulating layer, which has good insulation properties. At the same time, it has a large carrying capacity, does not contain halogens, and does not emit a large amount of smoke when burned. It also has flame retardant properties and is stable against ozone. It can be used in a low temperature environment of -50°C to prevent the conductive layer from cracking. Polytetrafluoroethylene is used to form the wrapping layer, which is a very heat-resistant material and can maintain its performance at extremely low temperatures, thereby improving the overall low-temperature resistance of the device.

[0012] 2. Butadiene rubber is used to form a low-temperature resistant layer, and diene nitrile rubber is used to form a protective layer, which further improves the overall low-temperature resistance of the cable. At the same time, diene nitrile rubber itself has wear resistance, which effectively protects the inside of the cable from the influence of low temperature. The armor layer can not only fully protect the cable core, but also significantly improve the overall mechanical properties of the cable, meeting the operation requirements of the cable in a low-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is an explosion diagram of the utility model;

[0015] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0016] Figure 4 It is a partial cross-sectional overall schematic diagram of the utility model;

[0017] Figure 5 It is a schematic diagram of the explosion of the conductive layer of the utility model.

[0018] Notes in the figure: 1. Conductive layer; 2. Insulating layer; 3. Tightening layer; 4. Filling layer; 5. Wrapping layer; 6. Shielding layer; 7. Lining layer; 8. Low temperature resistant layer; 9. Armor layer; 10. Protective layer. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0020] See also Figure 1 , Figure 2 and Figure 5 A low-temperature resistant overhead insulated cable comprises a conductive layer 1, wherein at least three groups of the conductive layer 1 are arranged, wherein the conductive layer 1 is formed by tightly twisting annealed copper wires, wherein the conductive layer 1 is formed into a cylindrical shape by tightly twisting annealed round copper wires, wherein when the conductive layer 1 transmits electric energy, it is beneficial for the current to pass through quickly, and at the same time, the conductive layer 1 will generate resistance, and the resistance is because the conductor material and structure of the high-voltage wire are not perfect, and the current encounters obstacles when passing through the conductor material, and since the electrons bounce when passing through the conductive layer 1, the current has some resistance, thereby generating resistance, and this resistance will cause the material to heat up.

[0021] See also Figure 2 and Figure 3 The conductive layer 1 is provided with an insulating layer 2 on its outside. The insulating layer 2 is made of cross-linked ethylene propylene rubber and is coated on the outer surface of the conductive layer 1 by an extruder. The cross-linked ethylene propylene rubber is used as the insulating layer 2, which has good insulation itself. At the same time, it has a large flow rate, does not contain halogen, and does not emit a large amount of smoke when burned; it also has flame retardant properties and ozone resistance stability, and can be used in a low temperature environment of -50°C to prevent the conductive layer 1 from being easily cracked. At the same time, the insulating layer 2 insulates the conductive layer 1 to prevent the conductive layer 1 from flowing out when transmitting electric energy, so that the device is charged as a whole, affecting the safety of use.

[0022] See also Figure 2 and Figure 4 The outside of the insulating layer 2 is fixed with a tightening layer 3 by overlapping wrapping. The material of the tightening layer 3 is polyvinyl fluoride. The tightening layer 3 is overlapped and wrapped on the outer surface of the insulating layer 2 with an overlapping rate of 20% of the width of the tightening layer 3. The tightening layer 3 is formed by winding with a polyvinyl fluoride tape. The polyvinyl fluoride tape is prepared from polytetrafluoroethylene dispersed resin and has a special fibrous microporous structure. It has the characteristics of low relative density, low dielectric loss, and little influence by temperature and signal frequency changes, stable dielectric constant, excellent temperature resistance, good weather resistance, etc. It can tighten the conductive layer 1 while being resistant to low temperature, thereby ensuring the overall low temperature resistance of the cable.

[0023] See also Figure 2 and Figure 4The outside of the wrapping layer 3 is filled with a filling layer 4, and the material of the filling layer 4 is made of acrylic fiber and viscose fiber carbonized at high temperature. The filling layer 4 wraps the three conductive layers 1 and forms a cylindrical shape. The filling layer 4 is made of acrylic fiber and viscose fiber carbonized at high temperature, with a carbon content of more than 92%, low density but high tensile strength and elastic modulus, which can reduce the weight of the product while maintaining strength; in addition, it has good corrosion resistance, fatigue resistance, creep resistance, heat resistance and high temperature resistance. In addition, it is easy to process and shape, and is easy to process into the required shape and structure. The main function of the filling layer 4 is to provide In order to improve the insulation performance of the high cable and the safety performance of the product, the filling layer 4 is filled in the internal gap of the cable to make the interior of the cable dense, thereby preventing external pollutants from entering the interior of the cable, reducing the risk of cable operation, and ensuring the normal operation of the cable; at the same time, the filling layer 4 can improve the insulation resistance of the cable, reduce the insulation barrier caused by the air medium inside the cable, and then eliminate the local discharge and breakdown caused by uneven potential distribution, thereby ensuring the safety and reliability of the cable. Since the filling layer 4 itself has heat resistance, the cable can withstand higher temperatures and voltages, thereby enhancing the service life and stability of the cable.

[0024] See also Figure 1 and Figure 4 The outside of the filling layer 4 is fixed with a wrapping layer 5 by overlapping wrapping. The material of the wrapping layer 5 is polytetrafluoroethylene. The wrapping layer 5 is overlapped and coated on the outer surface of the filling layer 4, and the overlap rate is 50% of the width of the wrapping layer 5. The wrapping layer 5 is formed by polytetrafluoroethylene, which is a very heat-resistant material and can maintain its performance at extremely low temperatures, thereby improving the overall low-temperature resistance of the device. At the same time, the wrapping layer 5 tightly wraps the filling layer 4 and the battery core composed of the conductive layer 1, the insulating layer 2 and the wrapping layer 3, further reducing the gap between the filling layer 4 and the battery core part, and reducing the risk of cable transmission of electrical energy.

[0025] See also Figure 2 and Figure 4A shielding layer 6 is fixed to the outside of the wrapping layer 5. The shielding layer 6 is woven with copper wire. The weaving density of the shielding layer 6 is in the range of 70% to 90%. The shielding layer 6 protects the flow of current inside the cable and can effectively isolate the electromagnetic field interference inside the cable and the interference from the outside. At the same time, the shielding layer 6 dissipates the heat generated by the conductive layer 1 transmitting electric energy to prevent the conductive layer 1 from having a high temperature. An inner lining layer 7 is fixed to the outside of the shielding layer 6 by aligning the wrapping. The material of the inner lining layer 7 is a polyester film tape. The inner lining layer 7 is fixed to the outer surface of the shielding layer 6 by seam wrapping. The polyester film has good heat resistance, corrosion resistance and aging resistance. At the same time, the polyester film tape also has high mechanical strength, which can effectively protect the internal structure of the cable and prevent the cable from breaking. At the same time, the inner lining layer 7 tightly wraps the shielding layer 6 inside it, so that the shielding layer 6 fits tightly with the wrapping layer 5.

[0026] See also Figure 1 and Figure 4 The outer part of the inner lining layer 7 is provided with a low-temperature resistant layer 8, the material of the low-temperature resistant layer 8 is butadiene rubber and is coated on the outer surface of the low-temperature resistant layer 8 by an extruder, the outer part of the low-temperature resistant layer 8 is twisted with an armor layer 9, the outer part of the armor layer 9 is provided with a protective layer 10, the armor layer 9 is formed by tightly winding low-carbon steel wires, the material of the protective layer 10 is diene nitrile rubber and is coated on the outer surface of the armor layer 9 by an extruder, the low-temperature resistant layer 8 is formed by butadiene rubber, and the protective layer 10 is formed by diene nitrile rubber, which further improves the overall low-temperature resistance of the cable. At the same time, diene nitrile rubber itself has wear resistance, which effectively protects the inside of the cable from the influence of low temperature. The armor layer 9 can not only fully protect the cable core, but also significantly improve the overall mechanical properties of the cable, and meet the operation requirements of the cable in a low-temperature environment.

[0027] During production of this utility model:

[0028] First, the annealed copper wire is formed into a cylindrical shape by a stranding machine, and the cross-linked ethylene propylene rubber is coated on the surface of the conductive layer 1 by an extruder to form an insulating layer 2 to achieve an insulating effect;

[0029] Then, the polytetrafluoroethylene tape is tightly wound around the outside of the insulating layer 2 to form a wrapping layer 3, so that the insulating layer 2 and the conductive layer 1 are closely attached to each other, and the conductive layers 1 are squeezed against each other. The outside of the wrapping layer 3 is filled with a filling layer 4 formed by high-temperature carbonization of acrylic fiber and viscose fiber. While filling, wrapping is performed, and the polytetrafluoroethylene tape is tightly wound around the outer wall of the filling layer 4 to form a wrapping layer 5. A shielding layer 6 formed by braiding copper wire is laid on the outer wall of the wrapping layer 5;

[0030] Next, a polyester film tape is wrapped around the outer wall of the shielding layer 6 to form an inner lining layer 7, and a low-temperature resistant layer 8 formed by butadiene rubber through an extruder is provided on the outer wall of the inner lining layer 7;

[0031] Finally, low-carbon steel wire is tightly wound on the outer surface of the low-temperature resistant layer 8 to form an armor layer 9, and diene nitrile rubber is extruded and coated on the outer surface of the armor layer 9 through an extruder to form a protective layer 10. After cooling, the cable production is completed.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low temperature resistant overhead insulated cable, characterized in that: The invention comprises a conductive layer (1), wherein at least three groups of the conductive layers (1) are arranged, wherein the conductive layers (1) are formed by tightly twisting annealed copper wires, wherein insulating layers (2) are respectively arranged outside the conductive layers (1), wherein a wrapping layer (3) is fixed to the outside of the insulating layer (2) by overlapping wrapping, wherein the wrapping layer (3) is filled with a filling layer (4), wherein a wrapping layer (5) is fixed to the outside of the filling layer (4) by overlapping wrapping, wherein a shielding layer (6) is fixed to the outside of the wrapping layer (5), wherein an inner lining layer (7) is fixed to the outside of the shielding layer (6) by aligning wrapping, wherein a low-temperature resistant layer (8) is arranged outside the inner lining layer (7), wherein an armor layer (9) is twisted outside the low-temperature resistant layer (8), and wherein a protective layer (10) is arranged outside the armor layer (9).

2. A low temperature resistant overhead insulated cable according to claim 1, characterized in that: The conductive layer (1) is made of annealed round copper wires that are tightly twisted to form a cylindrical shape, and the insulating layer (2) is made of cross-linked ethylene propylene rubber and is coated on the outer surface of the conductive layer (1) by an extruder.

3. A low temperature resistant overhead insulated cable according to claim 1, characterized in that: The material of the tightening layer (3) is polyvinyl fluoride, and the tightening layer (3) overlaps and covers the outer surface of the insulating layer (2) with an overlap rate of 20% of the width of the tightening layer (3). The material of the filling layer (4) is acrylic fiber and viscose fiber carbonized at high temperature, and the filling layer (4) wraps the three conductive layers (1) therein and forms a cylindrical shape.

4. The low temperature resistant overhead insulated cable according to claim 1, characterized in that: The material of the wrapping layer (5) is polytetrafluoroethylene, the wrapping layer (5) overlaps and covers the outer surface of the filling layer (4), and the overlap rate is 50% of the width of the wrapping layer (5), the shielding layer (6) is woven with copper wire, and the braiding density of the shielding layer (6) ranges from 70% to 90%.

5. The low temperature resistant overhead insulated cable according to claim 1, characterized in that: The material of the inner lining layer (7) is polyester film tape, and the inner lining layer (7) is wrapped and fixed on the outer surface of the shielding layer (6) by seam wrapping. The material of the low-temperature resistant layer (8) is butadiene rubber and is coated on the outer surface of the low-temperature resistant layer (8) by an extruder.

6. The low temperature resistant overhead insulated cable according to claim 1, characterized in that: The armor layer (9) is formed by tightly winding low-carbon steel wires, and the protective layer (10) is made of diene nitrile rubber and is coated on the outer surface of the armor layer (9) by an extruder.

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